1 By "calling it to witness", i.e., by speaking of the Day of Resurrection as if it had already occurred, the above phrase is meant to convey the certainty its coming.

I do call to witness5809 the Resurrection Day;

5809 Cf. 70:40, and n. 5700. Here the point to be enforced is understood: I have added it in brackets; "eschew Evil". The appeal is made to two considerations: (1) That every act has to be accounted for, and evil must have its recompense at the Resurrection; and (2) that man's own spirit has a conscience which would reproach him of sin, if he did not suppress that inner voice.

I do call to witness the Resurrection Day;
— Abdullah Yusuf Ali

Nay, I swear by the Day of Resurrection;
— Marmaduke Pickthall

Nay! I swear by the day of resurrection.
— M. Habib Shakir

I swear by the Day of Resurrection;
— Taqiuddin Hilali and M. Mohsin Khan

I swear by the Day of Resurrection.
— Abdul-Majid Daryabadi

No! I swear by the Day of Resurrection,
— Hasan Qaribullah and Ahmed Darwish